here is a possibility. in the fat is stored hormones. they live in there. when you lose weight those hormones are released into your system. they could cause a bit of disruption for a time, at least during the detox process. in fact one reason why people have a difficult time to lose weight is that they are also addicted to the homrones the extra fat produces. i wouldn't worry about it, you are doing the right thing, i would be willing ot bet that your bp will normalize over time again.